If you’re looking for a translation api, i found this online tool: translatewp.online, support translation between about 21 most used languages, accurate results, fast response, easy to integrate
This translation api is better alternative of google translate, deepl translation api, translated, transifex, microsoft translation machine, yandex translation api & others…
As you can see not only translation api, but you can translate your wordpress plugin/themes automatically to multiple languages, by providing the po/pot file, or even android apps by providing strings.xml file
Here’s a video for it:
